Methods for generating code sequences that have rapid acquisition properties and apparatus which implement the methods by processing spreading codes on in-phase and quadrature channels. A first method combines two or more short codes to produce a long code. This method may use many types...http://www.google.de/patents/US5748687?utm_source=gb-gplus-sharePatent US5748687 - Spreading code sequence acquisition system and method that allows fast acquisition in code division multiple access (CDMA) systems 
